The remap I had (see my introduction post), apparantly has a modified TC as well. As it was explained to me, the normal TC completely cuts fuel when it detects wheelspin. The remap changes this by cutting fuel to each cylinder on an individual basis, thus it can anything from one to all four cylinders, depending on how much the power has to be reduced to stop wheelspin.
The TC cutting in thus not completely stops progress, and the car keep accelerating although the TC is active. To be honest however, I'm usually quite gentle in lower gears so don't use it much. I can't also really remember the feel of the TC before the remap, so it's hard to analyse the difference.